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Published byPhebe Butler Modified over 8 years ago
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Lipids Lipids like carbohydrates contain only carbon, hydrogen and oxygen.
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Lipids again… We called carbohydrates sugars…what is a more common name for lipids? Fat!!! Oil!!! Wax!!!
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The Power of Lard… Fats and oils are chemically similar (we’ll see how soon). How do they differ? At room temp: Fats =Solid Oils =Liquid
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Important component of our diet. 1 gram of fat = 2x as much energy as 1 gram of carbohydrate.
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McDonalds, here I come…nope! If fats give more energy, why not use them as our main source? There are some health implications (which we’ll get to…), though some people would argue it’s not a bad thing.
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I’m getting hungry… Extra calories are stored as fat. All organisms use fats as a means to store energy. Plants store oils in seeds. Humans store fat under their skin (deposition varies).
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Forming Lipids Most lipids are composed of 2 different molecules: 1) A glycerol molecule 2) 3 fatty acid molecules
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Glycerol? Ok, so what’s glycerol? C C C H H H H H OH
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Are you calling me fatty? Let’s look at the fatty acid now: CCC H H H H H HO O Hydro- carbon
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Are you calling me fatty? Let’s look at the fatty acid now: CCC H H H H H HO O Carboxyl Group
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Fats, not phat… How do we get them to combine? Our old friend dehydration synthesis!!!
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Dehyrdation Synthesis of Lipids C C C H H H H H OH Glycerol HO—C—C 10 H 18 O O O + 3 Fatty Acids
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Dehyrdation Synthesis of Lipids C C C H H H H H O O O —C—C 10 H 18 O O O + H2OH2OH2OH2OH2OH2O 1 Fat Molecule+ 3 Water Molecules
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Good fat or a bad fat? There are two main types of fats. Both appear in the foods we eat. One is said to be good, one bad… Saturated Fat Unsaturated Fat = bad = good
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Saturated Vs. Unsaturated What does saturated mean? Saturated = unable to hold more; full What are fats “saturated” with? Hydrogens!!!
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More sat. vs. unsat. How can you tell sat fats from unsaturated fats? At room temperature: Saturated fats are solid. Unsaturated fats are liquid.
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Animals vs. Plants… Plants tend to store their lipids as oils… Saturated or Unsaturated? Unsaturated!!! Animals store their lipids as fat… Saturated!!!
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Butter vs. Margarine Where does butter come from? Milk (animal) fat. How about margarine? Vegetable oil.
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Butter vs. Margarine If margarine comes from vegetable oil, why is it a solid at room temp? Hydrogenation!!! What’s that you say? Hydrogenation is the process of adding hydrogen to an unsaturated lipid.
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Why hydrogenate? Well, unsaturated fats are better for you… …but if we hydrogenate them, they’re now saturated fats… So what’s wrong with saturated fats?
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Popeye was right to love Olive Oil… Saturated fats like meats and butter tend to increase your level of cholesterol… Cholesterol is a steroid that is essential in our bodies. However, too much cholesterol can clog your arteries…
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Triple bypass please…
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Should I hydrogenate then? In a word, no. Hydrogenating oils not only produces a saturated fat, which we’ve already said is bad, but it also slightly alters the bonds in our lipid… These altered bonds can cause colon-rectal cancer in people predisposed to cancer.
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What can I eat then? Try to stick to the unsaturated lipids, the oils…they’re relatively good for you. Otherwise, everything in moderation
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Fats: the 2 minute drill What are the two components of a lipid? Glycerol and 3 fatty acids. What are the two main categories of lipids? Saturated and Unsaturated
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Fats in focus Saturated fats at room temperature are… solids. Unsaturated fats are…liquids. Glycerol combines with 3 fatty acids through the process of… dehydration synthesis.
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